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Results tagged with symbols
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user 125
Mathematica symbols are the ultimate atoms of symbolic data. Every symbol has a unique name, exists in a certain Mathematica context or namespace, and can have a variety of types of values and attributes.
5
votes
Accepted
Method for determining valid name syntax?
There is the undocumented function Internal`SymbolNameQ:
Internal`SymbolNameQ /@ {"1st", "two wrds", "no_good", "al.most", "ok"}
{False, False, False, False, True}
- 401k
3
votes
Generating list of alphabet letters
lttrsF = FromCharacterCode /@ (ToCharacterCode[#][[1]] + Range[0, #2-1]) &
lttrsF["b", 4]
(* {"b", "c", "d", "e"} *)
- 401k
3
votes
Accepted
Hold all the symbols from a huge list?
You can use the fourth argument of Array as follows:
Array["X" <> ToString@# &, Num, 1, Hold[##] &]
Hold["X1", "X2", "X3", "X4", "X5"]
Array[Symbol["X" <> ToString@#] &, Num, 1, Hold[##] &]
…
- 401k
15
votes
Accepted
List of Mathematica glyphs
The guide Listing of Named Characters in Mma docs:
Mathematica provides systemwide support for a large number of special characters. Each character has a name and a number of shortcut aliases. The …
- 401k
9
votes
Accepted
need help to enter the orthogonal sign, the upside down T.
You need UpTee:
UpTee[x, y]
or
x \[UpTee] y
or, using the input alias,
x ESC uT ESC y
x ⊥ y
- 401k
11
votes
Accepted
Change nested list of symbols to nested list of numbers
symbols = {e4, {e200, {e1, {e11, e23}}}};
Map[FromDigits@StringDrop[SymbolName[#], 1] &, symbols, {-1}]
{4, {200, {1, {11, 23}}}}
Map[FromDigits @ StringCases[SymbolName[#], NumberString] &, symbols … #], NumberString], Listable]@symbols
And, inspired by Jack LaVigne's comment, Replace and ReplaceAll:
Replace[symbols, s_Symbol:> FromDigits[StringDrop[SymbolName[s], 1]],∞ ]
symbols /. …
- 401k
4
votes
Accepted
Mirroring the graph on the negative y axis
plot = Plot[Evaluate[Piecewise[{{Clip[#[x], {0, 5}], -Pi <= x <= 3 Pi}}, #[Pi]] & /@
{Sin, 1/2 + Sin[#] &, 3/2 + Sin[#] &}],
{x, -3 Pi, 6 Pi}, Filling -> 0]
1. You can use ReflectionTransfor …
- 401k
2
votes
How to use the Wolfram Language Symbol entity type to list all the entity types?
You can get the list of all entity types using EntityValue[]:
Row[EntityValue[], "▪"]
- 401k
0
votes
Elimination of terms not containing at least one variable from a set
You can also use Internal`LiterallyAbsentQ or Internal`LiterallyOccurringQ in combination with Replace, DeleteCases or Select:
r1 = Replace[expr , _?(Internal`LiterallyAbsentQ[#, keep] &) :> 0, 1];
T …
- 401k
7
votes
Accepted
Name of patterns cast as expressions from strings
StringCases["223", a : DigitCharacter ~~ b : DigitCharacter /;
Evaluate[Unequal @@ (ToExpression /@ Characters["ab"])]]
{23}
Compare the evaluation of the three forms using Trace:
Trace[Str …
- 401k